-ist

A scientist who specializes in the study of the origin, composition, history, structure, and processes of the earth.

One geologist claimed that geologists go to rock'n'roll concerts for entertainment and when they relax, they do it in a rocking chair; but their favorite kind of transportation is a rocket.

One who specializes in gerontology.

One who analyzes handwriting as an expression of character.

One who specializes in the scientific study of fish.

Someone who specializes in the science of microbiology or the science concerned with micro-organisms.

1. A person skilled in testing for defects of vision in order to prescribe corrective glasses.
2. A medical doctor specializing in the treatment of diseases of the eyes.

1. A physician specializing in the care and treatment of the eyes.
2. A specialist in ophthalmology or the medical and surgical specialty of eye care.

A health care professional who is licensed to provide primary eye care services:

1. To examine and diagnose eye diseases such as glaucoma, cataracts, and retinal diseases and, in certain states in the U.S., to treat them.
2. To diagnose related systemic (bodywide) conditions such as hypertension and diabetes that may affect the eyes.
3. To examine, to diagnose, and to treat visual conditions; such as, nearsightedness, farsightedness, astigmatism, and presbyopia.
4. To prescribe glasses, contact lenses, low vision rehabilitation, and medications; as well as, to perform minor surgical procedures; such as, the removal of foreign bodies.